The utility model discloses a waste heat application device for a polyester spinning machine, which comprises a heat exchanger, a surface cooler, a high temperature pool, one or two water pumps at ordinary temperature, two in a normal temperature pool, a warm water tank, The pump is fed into the inlet of the heat exchanger by means of a heat transfer device of the heat exchanger with the adjacent normal temperature water heat transfer, and the cooled high temperature water is passed from the outlet line through the pipe line 2 into the surface cooler Water storage room, after cooling the water with a cold air cooler cooler down to room temperature, with an external pipeline three normal temperature water into the room temperature pool First, the normal temperature of the pool within the two water temperature is set in the pipeline five The pump is fed into the heat transfer device inside the surface cooler, and after the adjacent high temperature water heat transfer heats up, flows into the external pipeline into the warm water tank. The utility model cools the high-temperature water to the normal temperature and uses the heat conduction to heat the outside water at room temperature, and can make the living water, the heat energy is recycled and the energy saving and environmental protection.